Where does “stameren” come from?

stameren (Middle English) comes from Old English stamerian, from Proto-West Germanic *stamrōn, from Proto-Germanic stamrōną, from Proto-Germanic -rōną.

Ancestry of “stameren”, step by step

Step	Language	Word	Meaning
1	Old English	stamerian	—
2	Proto-West Germanic	*stamrōn	—
3	Proto-Germanic	stamrōną	to stammer
4	Proto-Germanic	-rōną	—

Every word from Proto-Germanic -rōną →

stameren — Etymology, Origin & Word History | Etymology Explorer